From: Paul Eggert <eggert@CS.UCLA.EDU>
To: Andrew Morton <akpm@osdl.org>
Cc: Andy Isaacson <adi@hexapodia.org>,
bug-coreutils@gnu.org, linux-kernel@vger.kernel.org
Subject: Re: dd PATCH: add conv=direct
Date: Wed, 07 Apr 2004 13:46:31 -0700 [thread overview]
Message-ID: <87vfkbms7s.fsf@penguin.cs.ucla.edu> (raw)
In-Reply-To: <20040407111841.78ae0021.akpm@osdl.org> (Andrew Morton's message of "Wed, 7 Apr 2004 11:18:41 -0700")
Andrew Morton <akpm@osdl.org> writes:
> In 2.6 we do the check at open() and fcntl() time. In 2.4 we don't
> fail until the actual I/O attempt.
This raises the issue of what "dd conv=direct" should do in 2.4
kernels. I propose that it should report an error and exit, when the
write fails, since conv=direct can't be implemented. The basic idea
is that on systems that lack direct I/O, conv=direct should fail.
Another issue with this patch: in Solaris, direct I/O is done by
invoking directio(DIRECTIO_ON); see
<http://docs.sun.com/db/doc/816-0213/6m6ne37so?q=directio&a=view>.
Is Solaris direct I/O a direct analog to Linux direct I/O, or are
there subtle differences in semantics that should be made visible to
the users of GNU "dd"?
next prev parent reply other threads:[~2004-04-07 20:47 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-06 22:03 Andy Isaacson
2004-04-07 0:33 ` Andrew Morton
2004-04-07 16:21 ` Bruce Allen
2004-04-07 16:42 ` Andrew Morton
2004-04-07 17:31 ` Andy Isaacson
2004-04-07 18:18 ` Andrew Morton
2004-04-07 19:24 ` Andy Isaacson
2004-04-07 19:34 ` Andrew Morton
2004-04-07 19:47 ` Andy Isaacson
2004-04-07 20:03 ` Andrew Morton
2004-04-07 20:43 ` Andy Isaacson
2004-04-07 21:00 ` Valdis.Kletnieks
2004-04-07 21:35 ` Bruce Allen
2004-04-08 6:56 ` Paul Eggert
2004-04-08 11:07 ` Jim Meyering
2004-04-08 19:32 ` Paul Eggert
2004-04-08 19:51 ` Paul Jarc
2004-04-08 21:34 ` Jim Meyering
2004-04-08 16:23 ` Philippe Troin
2004-04-08 20:20 ` dd patch to remove noctty Paul Eggert
2004-04-08 21:40 ` Jim Meyering
2004-04-09 0:37 ` dd PATCH: add conv=direct Anton Blanchard
2004-04-09 1:42 ` Wim Coekaerts
2004-04-10 21:28 ` Jim Meyering
2004-04-07 20:46 ` Paul Eggert [this message]
2004-04-07 21:06 ` Andrew Morton
2004-04-07 21:09 ` Andy Isaacson
2004-04-07 19:12 ` Miquel van Smoorenburg
2004-04-07 20:14 ` Andy Isaacson
2004-04-07 22:02 ` Nathan Straz
2004-04-07 22:09 ` Andy Isaacson
2004-04-08 11:44 ` Miquel van Smoorenburg
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